连续升温条件下煤样瓦斯渗透特性试验研究

Experimetal study on gas permeation characteristics of coal samples heated continuously

为研究温度对煤样瓦斯渗透率的影响,采用含瓦斯煤岩热-流-固耦合三轴渗流试验装置,开展相应试验。结果表明:煤样渗透率随温度的升高呈S型下降趋势,具体可分为缓慢下降、加速下降、减速下降、二次加速下降、平缓等5个阶段;载荷作用下煤样的体积应变随温度升高而增大,变化过程可以分为上升-减缓-再上升-再减缓4个阶段,与渗透率随温度变化过程相对应。

In order to study the relationship between gas permeability of coal samples and temperature, relafed experiments were carried out with a gas-flow-solid coupling triaxial seepage test device. The results show that the permeability of coal samples decreases with the temperature, according with ＂S＂ type curve, that the permeability change curve can be divided into five stages, such as slow decline phase, deceleration phase, slow decline stage, secondary accelerated decline stage and flat stage, that the volumetric strain of coal samples under the action of loading decreases with the temperature, and that the change curve can be divided into four stages, corresponding roughly to those of the permeability-temperature cure.